turbo exhaust ar ?

[Big Bob]

what is the ExhaustAR:
of a 172

does any one know

 

[Big Bob]

:bump:

 

[stan*]

A 172 doesnt have a turbo.....

The AR ratio of any turbo is going to be dependent on the turbo design being used.

 

[Big Bob]

well whats best one to use on a clio

 

[stan*]

Thats goin to depend on the spec of your cams, the compression ratio, and the rest of the specof the engine in terms of what your trying to achieve.

typically you want to concentrate on the compressor housing in terms of maps and AR.

 

[Big Bob]

standard cams standard comp completely standard engine.

 

[stan*]

well personally I wouldnt fit a turbo to a standard engine, so all I can suggest is you maybe use a lowish Ar so as to aid low down boost. Then again if your not paying any attention to Cr and you favour low rpm boost, you may well find you experience detonation easily.

maybe you'd be best speaking to one of these "tuning" companies who sell bolt on "turbo kits".

 

[Big Bob]

well personally I wouldnt fit a turbo to a standard engine, so all I can suggest is you maybe use a lowish Ar so as to aid low down boost. Then again if your not paying any attention to Cr and you favour low rpm boost, you may well find you experience detonation easily.

maybe you'd be best speaking to one of these "tuning" companies who sell bolt on "turbo kits".

what would you call low 40 50 60 70 80 aqm only looking to run about 8 psi or something

 

[stan*]

0.42 is low, and typical on most units used on production cars.

 

[Big Bob]

i take it a low ar means a low max boost is that right
if so what boost will be max at 0.42 ar

 

[stan*]

Low Ar means low means lower flow required to achieve peak boost, however the flow potential of the turbo is reached lower down.

At a guess, 10-15 psi max depending on the set-up of the actuator/wastegate.

 

[Big Bob]

thanks for the advice stan